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Question
Distinguish between Nonchordata and Chordata.
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Solution
| Nonchordates | Chordates |
| 1. Notochord is absent in them | 1. Notochord is present in them at some of their developmental stage. |
| 2. Their central nervous system is solid and ventral | 2. Their central nervous system is hollow and dorsal. |
| 3. Heart, if present in them, is dorsal in position. | 3. Heart is always present and it is ventral in position. |
| 4. Their circulatory system is of open or closed type. | 4. Their circulatory system is of closed type. |
| 5. Respiratory pigment, the haemoglobin, if present, is dissolved in plasma of blood. | 5. Haemoglobin is present in their red blood cells or corpuscles. |
| 6. Pharyngeal gill slits are absent in them. | 6. Pharyngeal gill-slits are present in them. |
| 7. They contain anus at posterior end of body, so post-anal tail is not present. | 7. Their anus is not located at posterior tip of body, so contain a post-anal tail. |
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| Column I | Column II | ||
| (a) | Operculum | (i) | Ctenophora |
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| (g) | Choanocytes | (vii) | Mammalia |
| (h) | Gill slits | (viii) | Osteichthyes |
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